Will this hurt my heatsink?

Goebel14

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Aug 11, 2014
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I have an AMD Athlon X4 750K that I am reusing for a build and it has been sitting in the box for a few months with the thermal paste on it (it was from my first build so I didn't think of removing it before I put it in the box) and I am going to reapply thermal paste to it using Arctic Silver 5. I have cleaned the thermal paste off of the CPU and heatsink using 91% isopropyl alcohol and the CPU looks good, but the heatsink looks like it still has a little tint of grey in some places where the paste used to be. Will it hurt the CPU or heatsink if I reapply the thermal paste or will it be fine? Also, if I should clean it more should I use Arctic Silver cleaner and see if that makes the heatsink look cleaner?